Gypsum wallboard cutter



FIG. 1 is a top, right perspective view of the gypsum wallboard cutter showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear, left perspective view thereof; and

FIG. 4 is a bottom perspective view thereof. 

The ornamental design for a gypsum wallboard cutter, as shown. 